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diff --git a/c/src/libchip/rtc/README.m48t08 b/c/src/libchip/rtc/README.m48t08
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index 0000000000..d792d7957e
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+++ b/c/src/libchip/rtc/README.m48t08
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+#
+#  $Id$
+#
+
+
+Configuration Table Use
+=======================
+
+sDeviceName
+
+   The name of this device.
+
+deviceType
+
+   This field must be RTC_M48T08.
+
+pDeviceFns
+
+   The device interface control table.  This must be m48t08_fns.
+
+deviceProbe
+
+   This is the address of the routine which probes to see if the device
+   is present.
+
+pDeviceParams
+
+    This is ignored and should be NULL.
+
+ulCtrlPort1
+
+   This field is the base address of the RTC area of the chip.  The
+   NVRAM portion of the chip is ignored.
+
+ulCtrlPort2
+
+   This field is ignored.
+
+ulDataPort
+
+   This field is ignored.
+
+
+getRegister
+setRegister
+
+   These follow standard conventions.
+